调整配置查找方法
1. 不再用 range 对结构体 进行遍历；
2. 根据配置项决定是否采用正则匹配,正则匹配比字符串匹配要慢很多；

	modified:   Makefile.golang
	modified:   Makefile.linux
	modified:   doc/TODO
	modified:   etc/config.json
	modified:   src/config/config.go
	modified:   src/config/config_test.go
	deleted:    src/github.com/weidewang/go-strftime
	modified:   src/go-transit/httpd.go
	modified:   src/go-transit/main.go